make_optional.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
// <optional>
//
// template <class T>
// constexpr optional<decay_t<T>> make_optional(T&& v);
#include <optional>
#include <string>
#include <memory>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
using std::optional;
using std::make_optional;
{
int arr[10]; ((void)arr);
ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>);
}
{
constexpr auto opt = make_optional(2);
ASSERT_SAME_TYPE(decltype(opt), const optional<int>);
static_assert(opt.value() == 2);
}
{
optional<int> opt = make_optional(2);
assert(*opt == 2);
}
{
std::string s("123");
optional<std::string> opt = make_optional(s);
assert(*opt == s);
}
{
std::unique_ptr<int> s(new int(3));
optional<std::unique_ptr<int>> opt = make_optional(std::move(s));
assert(**opt == 3);
assert(s == nullptr);
}
return 0;
}